Ling Jianxue worked hard on cultivation inside the Black Tower.
All kinds of rare and valuable cultivation resources were funneled into him—high-level alchemical pills, Dragon Crystals, and all kinds of natural treasures. As long as he needed them, they would be immediately provided to him.
One day passed in the outside world, and this was equivalent to a whopping 100,000 days in the Black Tower.
Thus, in just 100 days in the outside world, Ling Jianxue had already reached the pinnacle of the Fourth Severance. He could already feel the barrier to the Fifth Severance.
This was inevitable. Ling Han, Hu Niu, and the Empress had all reached the Fifth Severance, so this allowed him to observe and learn from them all the time. He also possessed extraordinary talent himself, and he was able to utilize a boundless amount of cultivation resources. Thus, it would be strange if he couldn't feel the barrier to the Fifth Severance.